Throttle-valve.



1N.A 7543547. APATBNTED MAR. 15, 1904.

- J. DEsMoND.

THROTTLE VALVE.

A ArrLIoATIolr rum) AUG. 14. 1903.

Io Holm.,

MM5-Qur Y y 'fm/fm @jig/' UNITED STATES Patented March 15, 1904.

PATENTy OFFICE.

JOHN DESMOND, ,OF CINCINNATI, OHTOfASSIGNOR TO THE WILLIAMy POWELL CO., OF CINCINNATI, OHIO, A CORPORATION OF OHIO.

THROTTLB-VAL'VE.

SPECIFICATION forming` part of Letters Patent No. 754,547, dated March 15, 1904.

Application iledAugUSt 14, 1903- To all whom it may concern.-

of Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and n useful Improvements in Throttle-Valves; and

I do declare the following'to be a clear, full, and exact description thereof, attention being called to the accompanying drawings, with the referenceI characters marked thereon, which form also a part of this specification.

This invention relates to improvements in throttle-valves of the kind where the valve operates with a sliding movement to and from its seat, the operation being usually by means of a lever-handle.

The leading object of this invention is to so nearly balance this valve by the steam-.pressure K as to render its operation and control convenient land delicate, permitting also a quick manipulation, if necessary, and prevent all possibilities which would hinder a free and ready movement and easy lift.

Another object is to prevent wear by the eroding and abradive action of the steam, which cuts the metal when such steam at the timel the valve is nearly closed rushes through the contracted space in a thin stream or sheet.

The invention consists, therefore, of the particular construction whereby these objects are attained, and to which are added such features of construction which tend to improve the manufacture of the valve in general.`

In the following specification, and particularly pointed out in the claims following, is found a full description of the invention, to-

gether with its operation, parts, and construetion, which latter is also illustrated in the accompanying drawings, in which- Figure 1 is al vertical section of the valve, showing the same with all parts in their normalthat is,closed-position. Fig.2 in asimilar view shows the same open. Fig. 3 shows the valve proper in side elevation. Fig. 4 is a top view and horizontal section on line 4 4 of Fig. 1. v n

In the drawings, 10 indicates the usual valvehousing, having customary attaching-nipples 11 11 at each end. At the side it is provided serai No. 169,418. (No model.)

with an opening to permit insertion of the internal parts and access to them thereafter. This openingis closed by a cap 12, which latter contains also the opening through which the valve-stem 13 passes. A customary stuffing-box 14 is provided to prevent leakage where the stem passes through. lis the operating-handle connected to the upper end of the valve stem and pivotally attached by means of a link 16. The interior of thevalvehousing is divided in the usual way by partitions 17 17, communication between the di" vided parts being by a passage through these partitions controlled by a valve 18. This valve is fitted against a seat 19, which by preference is contained in an independentring secured detachably for renewal to parts of .partitions 17. This ring or-(if none is used) the corresponding parts of the dividing-partition are of considerable thickness oi' height, as shown at 21, to afford s ubstan tial support and guidance to a cylinder 22, connected so as to form a part of valve 18 and to partake in the movement of the same.

This cylinder is open at both ends to permit ingress above and egress below of the steam and for which purpose the connection to valve 18'is by arms 23. which do not interfere with i the passage of the steam. This cylinder, in con- Junction with adjacent parts of the valve-housing surrounding it, forms a chamber 24, which ,since it is capable of moving with the valve and for purposes of designating its function Icall a movable valve-chamber. The lower edge of this cylinder is cut out, as shown at 25, for pur-poses tosbe presently explained. The connection of this valve to its operating-stem 18 is not a direct one; but it is'by an intermediate or auxiliary valve 26, whichvalve permits a preliminary admisson of steam to chamber 24, and the construction is suchthat 'in operating valve 18 the auxiliary valve is also operated, the operation of this latter, however, slightly preceding the operation of the main valve. In detail this construction is as follows: Valve 18 has an opening 27 connecting with chamber 24 and around which opening a-valveseat 28 is formed for valve 26. This valve consists substantially of two hollow plugs, one,

29, seated on stem 13 and held thereon by a shoulder 31. It is externally screw-threaded and receives the internally-threaded plug 32, which has valve 26 on its lower end and is screwed onto plug29 against the vlower enlarged end of the valve-stem. The auxiliary valve is thus firmly held to the val ve-stem. It

is heldin position for the purpose of guiding it to and from its seat 28 by a housing 33, form-- shown at 35. A number of openings forming steam-ports 36 permits communication of the steam side of' valve-housing 10 with the interior of chamber 24, subject to control by valve 26. The diameter of this latter opposite the inner end of these ports is somewhat reduced, as shown at 37, to facilitate a quick entrance and passage of steam and distributes the same over the entire area of opening 27.

-With the parts thus described their opera-` tion is as follows: Thefirst effect of action on handle 15 for the purpose of opening valve 18 is the lifting of auxiliary valve 26, (see dotted lines in Fig. 2,) admitting steam to chamber 24, which being instantly filled by steam causes valve 18 to become balanced, since there is now steam belo'w it as well as on top of it. Further action on handle 15 now causes also valve 18 to leave its seat and become open,

which manipulation may be performed freeand easy and without any perceptible lifting effort. Atthe beginning of such opening or immediately before closing and while the opening between the valve and its seat is yet very limited and narrow the action of the contracted and thin stream or sheet of steam forcing its passage through between valve and seat is very severe on them, causing extreme erosion by abrading the metal and cutting into the same. This is avoided by preventing fiow of steam while the opening between valve and its seat is yet narrow and deferring such until the valve is well clear of its seat and fairly open, thus preventing the cutting action of the steam on this latter. This is accomplished by the length ofcylinder 22, which is such as to prevent escape of steam at its lowereend until valve 18 has been raised to a proper height above its seat. Even then the fiow of steam is startedonly gradually, which is due to the serrated cutouts 25y around the lweredgc of cylinder 24, and.whereby steam is permitted to escape first only through the narrowest part of these cuts, the escape and passage increasing in volume as these gradually-widening cuts upper end of said valve, or a groove 39 may be' cut in its side. The same series ofactions take place, only in reversed order, when the valve is closedthat is, the lower edge of cylinder 22 intercepts the passage of steam first and before' valve 18 has approached its seat and reduced the space between the two so'close as to cause the serious effects sought to be obviated. Y

Having described my, invention, I claim as new f 1. In a throttle-valve, the combination of a valve-housing, a main valve therein, a cylinder open at both ends connected so as to move with this valve and forming with adjacent parts of the valve-housing a movable valve-chamber which is normally closed, an auxiliary valve permitting access of steam to this valve-chamber, a valve-stem to manipulate this auxiliary valve and operative connection between it and the main valve whereby by extended manipulation of the auxiliary valve the main valveis also opened.

2.` In a throttle-valve, the combination of a valve-housing` a valve, a seat for the same formed by internal parts of the valve-housing, a cylinder open at both ends connected to this valve in a manner to move with the same and fitted against the. interior parts of the valvehousing forming in conjunction with them a IOO normally closed, sliding valve-chamber and l means to raise the valve off of its seat, and to charge sliding valve-chamber with steam without and before continued manipulation permits such steam to pass out.

3. In athrottle-valve, the combination of a valve-housing, a valve, aseat for the same being formed by internal parts of the valve-housing, said parts being extend ed below such seat,

a cylinder open at its lower end fitted steamtight into this downwardly-extended part of the valve-seat and attached to the valve in a manner to leave a space between this latter and its open upper end to permit ingress of steam tlfereat, an internal annular lip fitted around the lower end of this cylinder, which end in the normal or closed position of the valve extends below this lip and means to raise the valve off of its seat.

4. vIn a throttle-valve the combination of' a valve-housing, a valve, a seat formed for the same by internal parts of the valve-housing, which partsl are extended below such seat, a cylinder open at both ends fitted into this down-- wardly-extendcd part of the valve-housing, arms whereby this cylinder is attached to the underside of the valve and means whereby IIS l both are simultaneously manipulated to peri mit ysteam to pass into and through this cylinder.

5. In a throttle-valve, the combination of' a valve-housing a main valve therein, a cylinder open at both endsconnected so as to move -with this Valve and forming with adjacent parts ofthe valve-housing a movable valvechamber and normally closed by these adjacent parts of the valve-chamber, an opening in this main valve, an auxiliary valve controlling passage through this opening with the movable valve-chamber mentioned, a housing formed in the upper part of the main valve and into which this auxiliary valve is fitted, ports in 4the housing to admit steam to it, means to manipulate this auxiliary valve and operative connection between it and the main valve whereby this latter may be opened only after the auxiliary valve is open.

6. In a throttle-valve, the combination of a valve-housing a mainvalve therein, a cylinder open at both ends connected so as to move with this valve and forming with adjacent parts of the valve-housing a movable valvechamber, an opening in this main valve, an auxiliary valve controlling passage through this opening and into the sliding valve-chamber mentioned, a housing formed on the upper part of the main valve and into which this auxiliary valve is fitted, ports in this housing to admit steam to it, a valve-stem connected to this auxiliary valve, a-nut above this latter and fitted to the upper end of the open .housing to confine the auxiliary valve therein, thereby connecting also both valves to the valvestem, there being a clearance-space between this nut and the auxiliary valve permitting for this latter a limited independentmovement within its housing and means to manipulate the valve-stem to effect a preliminary admission of steam to the movable valve-chamber to balance thc main valve before its opening.

7. In a throttle-valve, thc combination of a valve-housing, a main valve therein, a cylinder connected so as to move with this valve and forming with adjacent parts of the valvehousing a movable valve-chamber, a valvestem having an enlarged end, two plugs having complementary screw-threads fitted onto this valve-stem and which when engaged inclose between them thc enlarged end of' this latter, the outer or lower one of' these plugs forming also a valve, an opening in the main valve which this valve is fitted to close, means to manipulate the valve-stem to open this valve and operative connection between the tWo valves whereby the main valve is opened by the other valve after this latter has been opened by the valve-stem. y

8. In a throttle-valve, the combination of a valve-housing, a valve, a seat for the same being formed by internal parts of thevalvehousing, said parts being extended below such seat, a cylinder open at itsv lower end fitted steam-tight into this downwardly-extended part of. the valve-seat and attached to the JOHN DESMOND.

Witnesses:

JAMES POWELL, C. SPENGEL. 

